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-- Copyright 2026 Shota FUJI
--
-- This Source Code Form is subject to the terms of the Mozilla Public
-- License, v. 2.0. If a copy of the MPL was not distributed with this
-- file, You can obtain one at https://mozilla.org/MPL/2.0/.
--
-- SPDX-License-Identifier: MPL-2.0


module Url.SearchParams exposing (build, parse)

import Dict exposing (Dict)
import List
import String
import Url


parseParameter : String -> Maybe ( String, String )
parseParameter p =
    case String.split "=" p of
        [] ->
            Nothing

        [ key ] ->
            Maybe.map
                (\k -> ( k, "" ))
                (Url.percentDecode key)

        [ key, value ] ->
            Maybe.map2
                Tuple.pair
                (Url.percentDecode key)
                (Url.percentDecode value)

        _ ->
            Nothing


parse : String -> Dict String String
parse qs =
    qs
        |> String.split "&"
        |> List.filterMap parseParameter
        |> Dict.fromList


buildParameter : ( String, String ) -> String
buildParameter ( key, value ) =
    case value of
        "" ->
            Url.percentEncode key

        _ ->
            Url.percentEncode key ++ "=" ++ Url.percentEncode value


build : Dict String String -> String
build dict =
    dict
        |> Dict.toList
        |> List.map buildParameter
        |> String.join "&"